The correct answer is Gajner Lake.
- Gajner Lake is also known as a pure water mirror.
Key Points
- Gajner Lake-
- This lake is situated in the Bikaner's Gajner wildlife sanctuary.
- This lake was built by Maharaja Ganga Singh.
- This lake is also known as a pure water mirror.
Important Points
- Gajner is an incomparable jewel of the Thar.
- The Gajner Palace was founded by Maharaja Gaj Singh Ji of Bikaner and then completed by the great Maharaja Ganga Singh of Bikaner on the banks of the lake.

Additional Information
- Bhopal Sagar-
- This lake is situated in the Chittorgarh.
- This lake was built by Maharaja Bhupal Singh.
- This lake receives water from Matrakundia Dam.
- Ram Sagar-
- This lake is situated in Dholpur.
- This lake is surrounded by the Ram Sagar wildlife sanctuary.
- Nand Samand-
- This lake is situated in Rajsamand.
- This lake is also known as Rajsamand's lifeline.
